Comments

The i9-9900K or Ryzen 9 3900X is a nice step up. While the Ryzen has more cores and benches higher, in many practical applications it will be hard to tell the difference. Overclocking is a nice feature you have with the 9900K while AMD have all but made Overclocking redundant on their platforms. Either way though you cannot go wrong they are both great chips.

My last build was 2011 with the i7 2600K

If you had told me in 2011 that this CPU would still be up to most challenges today in 2020 I would have thought you were nuts.